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Subject[PATCH v3 06/16] kvm: x86: svm: Add support to activate/deactivate posted interrupts
Date
Introduce interface for activate/deactivate posted interrupts, and
implement SVM hooks to toggle AMD IOMMU guest virtual APIC mode.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
arch/x86/include/asm/kvm_host.h | 4 ++++
arch/x86/kvm/svm.c | 44 +++++++++++++++++++++++++++++++++++++++++
arch/x86/kvm/x86.c | 5 +++++
3 files changed, 53 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index a50fca1b..624e883 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1193,6 +1193,10 @@ struct kvm_x86_ops {

int (*update_pi_irte)(struct kvm *kvm, unsigned int host_irq,
uint32_t guest_irq, bool set);
+
+ int (*activate_pi_irte)(struct kvm_vcpu *vcpu);
+ int (*deactivate_pi_irte)(struct kvm_vcpu *vcpu);
+
void (*apicv_post_state_restore)(struct kvm_vcpu *vcpu);
bool (*dy_apicv_has_pending_interrupt)(struct kvm_vcpu *vcpu);

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 245bde0..8673617 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5398,6 +5398,48 @@ static int svm_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
return ret;
}

+static int svm_set_pi_irte_mode(struct kvm_vcpu *vcpu, bool activate)
+{
+ int ret = 0;
+ unsigned long flags;
+ struct amd_svm_iommu_ir *ir;
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ if (!kvm_arch_has_assigned_device(vcpu->kvm))
+ return 0;
+
+ /*
+ * Here, we go through the per-vcpu ir_list to update all existing
+ * interrupt remapping table entry targeting this vcpu.
+ */
+ spin_lock_irqsave(&svm->ir_list_lock, flags);
+
+ if (list_empty(&svm->ir_list))
+ goto out;
+
+ list_for_each_entry(ir, &svm->ir_list, node) {
+ if (activate)
+ ret = amd_iommu_activate_guest_mode(ir->data);
+ else
+ ret = amd_iommu_deactivate_guest_mode(ir->data);
+ if (ret)
+ break;
+ }
+out:
+ spin_unlock_irqrestore(&svm->ir_list_lock, flags);
+ return ret;
+}
+
+static int svm_activate_pi_irte(struct kvm_vcpu *vcpu)
+{
+ return svm_set_pi_irte_mode(vcpu, true);
+}
+
+static int svm_deactivate_pi_irte(struct kvm_vcpu *vcpu)
+{
+ return svm_set_pi_irte_mode(vcpu, false);
+}
+
static int svm_nmi_allowed(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@@ -7321,6 +7363,8 @@ static bool svm_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
.deliver_posted_interrupt = svm_deliver_avic_intr,
.dy_apicv_has_pending_interrupt = svm_dy_apicv_has_pending_interrupt,
.update_pi_irte = svm_update_pi_irte,
+ .activate_pi_irte = svm_activate_pi_irte,
+ .deactivate_pi_irte = svm_deactivate_pi_irte,
.setup_mce = svm_setup_mce,

.smi_allowed = svm_smi_allowed,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bc74876..1540629 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7198,6 +7198,9 @@ void kvm_vcpu_activate_apicv(struct kvm_vcpu *vcpu)
kvm_apic_update_apicv(vcpu);

kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu);
+
+ if (kvm_x86_ops->activate_pi_irte)
+ kvm_x86_ops->activate_pi_irte(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_vcpu_activate_apicv);

@@ -7212,6 +7215,8 @@ void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu)

vcpu->arch.apicv_active = false;
kvm_apic_update_apicv(vcpu);
+ if (kvm_x86_ops->deactivate_pi_irte)
+ kvm_x86_ops->deactivate_pi_irte(vcpu);
kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_vcpu_deactivate_apicv);
--
1.8.3.1
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